If a 383 has 7.100 rods, then the piston compression height
would be around 1.200 inches, the factory piston CH is around
1.950 with the stock 6.36 rods.
I'm building something really similar, long rod 400.

I remember Dave Wren running a old Cam Dynamics R282 solid roller in his 1971 Cuda 383 SS car in SS/H I think, he let the clutch out around 8000 RPM and tried to shift it between 8600 to 8800 RPM
The original Racer Brown that owned that company back in the day probably designed and ground that camshaft for Mopar before they starting opening the doors to the lowest bidders in the early 1980s to the mid 1980s
I also remember Joe Alread doing a series of articles on his Mopar sponsored 1972 Road Runner 400 stick car for either Hot Rod or Car Craft magazine in 1972, it had a solid lifter Racer Brown camshaft in it, I'm not sure which grind though
My message is there are a lot of better cam grinds to choose from today than back 30 yrs ago

I think AndyF built a long rod 400 with a short piston years ago that did pretty well. Don't think it was 7.100" though.

You're one of the few guys that knows how to build a bass ass combo with cheap parts. That's cool with small cubic inches as well.

I used Hemi +0.100 rods with off the shelf 1.32 high pistons and a 383 forged crank in a 400 block. It was an off the shelf way to build a high compression 400 back before kits were available. It did work pretty well, that engine made around 600 hp with Porter Racing Head Edelbrock heads. It was a in daily driver Duster that went 10.90 on street tires with full exhaust, full interior, etc. The guy used to drive it to work.

It's not a common combination, so the odds of anyone being able to provide applicable cam comparison data is slim.

Not sure if any SFT cam change would show a big improvement without taking the time to try a bunch of different ones. Small port heads, small cubes... it might not "need" or "want" much difference in valve events or lift.

If you're running race gas already, bumping up the CR might be the easiest way to find some additional power across the RPM range.

Not to mention that most of the fast rate stuff is probably going to require higher spring loads than what std lifters are going to be happy with if you’re trying to buzz the motor 8000.

I have a Direct connection .606 lift cam i going to use in a 340, the duration on these cams will definitely let you wind them up.

A long way back, Hot Rod did a MP purple shaft compare in a big block. They used the 296/557 and the .590 cam against a few others. The .590 held it's own very well. Pay attention to the competitors cam durations.

Here it is, read on brother!

And just tell people that these "Old Dino Cams" just flat out work. Never mind that there old.

That's buzzing pretty good.

I've never turned mine loose past 7200.

Maybe I need to turn it this year.

Because we all pretty much like Hutch, I'll bump this post again. My original thoughts were noone bats an eye when a 3000 pound Camaro with a 383 and good heads runs the same numbers. It's not to take away from that it runs good for what is being used but, it seems peoples expectations are low for performance.

how much difference would this shaft make with a 440 shifting at 62-6400, pocket ported RPM's, 10.8cr, 600 or so more lbs. ?

Compared to what ?

Eddy/.590 combo ran 10.8-10.9 in a 3700lb+ GTX. No electric water pump, battery up front.
Doug

If you want to go faster, you could tighten the intake lash .010 and see if it likes it. Then try the exhaust. More compression will help as long as you don't have a big dome on the piston. I am geussing you have thrashed it enough to know what it wants for timing. If not back it down a couple first, and see if it helps.

to the 383 example mentioned.

"Fading color" cam comparo article was done a few years back on a 421 inch small block, cam manufacturers all took their best shot,and the .590 beat all but one.

Keith Dunnuck did a cam comparison and a hughes solid cam made 17 hp more than the .590.

Referring to Dunnucks test........ I generally feel that engine builders who work with a lot of the same type of motors often have a good feel for what they like for camshafts.

This proved to be the case in that series of cam tests with the 421 stroker.
Dave Hughes had more experience with that type of build than whoever they got on the phone at the other cam suppliers.
I felt the Comp cams in particular that were tested were pretty far off from what I would have used.
Comp has some really nice lobes available, but what they’re offering for solid flat tappet drag race listings in the catalog leaves a lot to be desired.

Did try lashing it to. 024" once cold to be lazy as doing a hot lash makes a mess because these heads don't drain very well. Car lost 2 tenths. If anything it likes the lash a bit loose. Cam is currently retarded 4 degrees also. Tried it 2 degrees advanced, hates that too.


Hutch